/**
 * @file hello.cpp
 * @author chenwei (3190104818@zju.edu.cn)
 * @brief 
 * @version 0.1
 * @date 2021-09-22
 * 
 * @copyright Copyright (c) 2021
 * 
 */
#include <iostream>

int main()
{
    std::cout << "Hello, world!" << std::endl;
}